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J. W. SMITH.

GOLD FOIL ANNEALING APPARATUS.

No. 263,607. Patented Aug. 29, 1882.

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N. PETERS. Phum-Liihcgmuhan Washington. \10

Y UNITED STATES Joan WILLIAM SMITH, on

NEWPORT, RHODE ISLAND.

GOLD-FOlL-ANNEALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 263,607, dated August29, 1882.

Application filed July 1, 1882.

To all whom it may concern:

Be it known that I, JOHN WILLIAM SMITH, of Newport,in the countyofNewport and State of Rhode Island, have invented a new and 1mprovedGold-Foil-Annealing Apparatus, of which the following is a full, clear,and exact description.

My invention consists of an apparatus contrived for heating a plate ofmetal or other suitable material whereon gold-foil or other preparationsof gold for filling teeth may be annealed more uniformly than by themeans at presentemployed.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a perspective view of my improved gold-foil-annealingapparatus with part of the side and top broken out. Fig. 2 is a planview with the cover removed, and Fig. 3 is a sectional elevation of Fig.2 on line a: w.

The base 01 of the annealing apparatus is made of thin metal of anysuitable kind and of any approved form, and is filled preferably withplaster-of-paris and asbestus, but any desired heat non-conductingmaterial, I), may be used. The non-conductor serves to prevent undueheating of whatever the device rests upon.

A system of parallel metal tubes, 0, is so connected with a tube, 6,placed at right angles to them as to receive a supplyof illuminating-gasthrough the gas-supplying tube g, connected it with the tube 0 at j. Ineach of the parallel tubes 0 are a number of perforations, f, throughwhich gas escapes, and in burning produces a distinct flame over eachaperture. Within certain limits the number of tubes e and the number ofperforations in each may be increased or diminished, ortheir mutualrelations changed, my idea being to have their number and relations suchthat the plate supported over them, hereinafter described, may be heatedmore uniformly throughout its entire surface than is practicable whenonly one or two flames are employed. The system of parallel tubes issupported on the legs it about an inch above the top of the base d.

(No model.)

sheet-metal sides 0, a plain sheet-metal upper surface, a, and awire-gauze partition, I), is placed over the'system of burners and restsupon the base 01, as shown in Figs. 1 and 3. The cover a b c is liftedoff whenever the gas a b may be united and detached from the sides 0,and only the former need be raised for lightin g the gas. The plate amay be either smooth made either of metal, porcelain, earthenware, .orany other suitable material, or of a combination of suitable materials.The wire-gauze or perforated partition I) is placed about onefourth ofan inch below the metal plate a and about the same distance above thetubes 0 c g, and it serves to make the gas burning over the apertures inthe tubes non-luminous, and to diffuse the heat evenly over the undersurface of the plate a. The perforated metal sides 0 supportthe parts ab, and also prevent drafts of air from extinguishing the gas-flames,while the perforation admit sufficient air to maintain combustion. Forthese sides I prefer to use perforated tin or other proper material,having. about sixteen perforations each way to the square inch.

The supply-tube g is connected with the tube e at j, and from this pointit passes down to the based and along through the non-conductor to theopposite end of the base, where it passes out, the non-conductorpreventing the tube from being overheated. I

About half an inch from the outside of the base cl the tube 9 supports aBunsen burner, k, and about two inches from the base is attached arubber tube and a gas-regulator. The Bunsen burner supplies a singleflame for super-annealing single pieces of gold. The tube 7a oftheburner is made preferably of glass, although metal may be usedinstead. The tube is held in a perpendicular position by the wire 0,which is soldered to the. lower side of the tube 9, and is bent upwardon each side of the tube, the two upwardly-projecting ends passing intothe tube k. If a metallic tube is used instead of the glass, it may besoldered to -rthe tube g. At the lower end of the tube 70 is aperforation in the tube 9 for the escape of is to be lighted; but,if itis preferred,the parts.

A removable cover, consisting of perforated or roughened on its uppersurface, and may be gas to the burner, and air is admitted at the lowerend of the burner to render the flame non-luminous, the tube beingadapted to be raised or lowered to regulate the proper admission of air.I

piece is required to be more cohesive, it may be heated over the tube7c.

For the sake of convenience in use the whole apparatus is made as low asis practical, about two and one-half inches being a. desirable height.

The tubes 0 and e are placed as near the base as they can be Withoutinterfering with a sufficient supply of air to the centrally-l0- catedgas-jets.

This annealing apparatus is ornamental, simple in operation, and readyfor use Within one minute after the gas is lighted. While it is intendedparticularly for annealing gold, it is useful for warming water, and isespecially adapted to Warming gutta-percha for fillings.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a foil-annealing apparatus, the combination, with the gas-supply pipe9, branch pipe 6, and perforated parallel pipes e, of theannealing-table a, perforated sides 0, and the wire-gauze partition 1),extending from side to side 0 beneath the table a, over the perforatedburner-pipes e, as shown and described.

JOHN WILLIAM SMITH.

